Regular season totals, playoffs not included

Revised as of 8/28/2012

Quarterbacks are ranked according to DYAR, or
Defense-adjusted Yards Above Replacement. This gives the value of the
quarterback 's performance compared to replacement level, adjusted for situation
and opponent and then translated into yardage. DYAR
(and its cousin, YAR, which isn't adjusted based on opponent) is further explained here.

The other statistic given is DVOA, or Defense-adjusted Value Over Average. This number represents
value, per play, over an average quarterback in the same game
situations. The more positive the DVOA rating, the better the player's
performance. Negative DVOA represents below-average offense. DVOA (and its cousin, VOA, which isn't adjusted based on
opponent) is further explained
here.

The simple version: DYAR means a quarterback with more total value. DVOA means a quarterback with more value per play.

Effective Yards, listed in red, translate DVOA into a yards per
attempt figure. This provides an easy comparison: in general, players
with more Effective Yards than standard yards played better than standard
stats would otherwise indicate, while players with fewer Effective Yards
than standard yards played worse than standard stats would otherwise
indicate. Effective Yards are not the best way to measure total value
because they are more dependent on usage than DYAR.

Passes total includes sacks and aborted snaps. Both count against a quarterback's value.

Intentional clock-stopping spikes are not counted as passes, which may cause
completion rate to be different from official NFL stats.

Fumbles count the same whether lost to the defense or retained by the offense.

DPI lists the number of plays and yards where the quarterback drew
Defensive Pass Interference. These plays are incorporated into DVOA and DYAR,
but are not included in the totals for Passes or Yards.

Clicking on a player's name will bring you to his FO player page with advanced stats through the most recent season.